Fix trivial compiler warnings

2.2.x patch: http://home.apache.org/~ylavic/patches/httpd-2.2.x-fix_trivial_warnings.patch

Reviewed by: ylavic, covener, wrowe



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1777492 13f79535-47bb-0310-9956-ffa450edef68